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Stockholders' Equity - Narrative (Details)
$ / shares in Units, shares in Millions
3 Months Ended
Apr. 30, 2024
USD ($)
plan
$ / shares
shares
Apr. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
Mar. 31, 2022
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock-based compensation plans | plan 3      
Unrecognized compensation cost, options $ 0      
Employee stock purchase plan, compensation expense $ 142,504,000 $ 144,706,000    
Stock repurchase program, authorized amount       $ 200,000,000
Stock repurchase program, additional authorized amount     $ 300,000,000  
Repurchases of common stock (in shares) | shares 2.5 0.7    
Average price per share of stock repurchased (in usd per share) | $ / shares $ 58.78 $ 57.06    
Aggregate purchase price of stock repurchased $ 149,063,000 $ 40,472,000    
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, RSUs $ 1,000,000,000      
Unrecognized compensation cost, remaining weighted-average period for recognition 2 years 10 months 17 days      
RSUs | Market Based and Performance Based Vesting Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of unvested RSU's $ 116,600,000      
Performance vesting percentage 100.00%      
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock purchase plan, compensation expense $ 3,000,000 $ 4,200,000    
2018 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reserved for future issuance (in shares) | shares 47.0      
2018 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reserved for future issuance (in shares) | shares 12.1